These complaints include the papers and oral discussions offered on the Symposium on AERODYNAMIC DRAG MECHANISMS of Bluff our bodies and highway Vehides held on the basic vehicles examine Laboratories in Warren, Michigan, on September 27 and 28, 1976. This foreign, invitational Symposium used to be the 20 th in an annual sequence, each having been in a distinct technical self-discipline. The Symposia supply a discussion board for components of technological know-how and know-how which are of well timed curiosity to the study Laboratories as weIl because the technical neighborhood at huge, and within which body of workers of the Laboratories are actively concerned. The Symposia provide a chance for the alternate of rules and present wisdom among engaging study experts from academic, commercial arid governmental associations and serve to stimulate destiny study task. the current world-wide power state of affairs makes it hugely fascinating to minimize the strength required to maneuver street autos throughout the surroundings. an important quantity of the complete power ate up for transportation is expended in overcoming the aerodynamic resistance to movement of those automobiles. rate reductions during this aerodynamic drag can accordingly have a wide impression on floor transportation strength specifications. even if aerodynamic improvement paintings on street vehides has been played for a few years, it has no longer been broadly suggested or followed by way of a lot uncomplicated research.

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Smoke was used to study the flow field as the gap increased, see Fig. 6. The separation from the tractor roof associated with zero gap quickly diminished, and disappeared. A second stagnation streamline impacted upon the exposed face of the trailer, and was well-established at a gap of 20 percent. Some of the flow over the tractor roof turned and became a high velo city downflow through the gap. There was no evidence of lateral flow - all flow was downward. The flow up the trailer face separated from the sharp leading edge of the trailer roof; the flow to either side References pp.

The drag also remained at the zero-gap level, as indicated by the data presented in Fig. 9. The plate prevented increased exposure of the trailer face to the approaching flow, and the shielding effect of the tractor was maintained. References pp. 89-90. W. T. , P. S. BEEBE 54 Fig. 8. E. 25. " ... E . 5 g/d Fig. 9. E. sleeper tractor-trailer. TRUCK AND BUS DRAG 55 Traetor Size and Shape. Differences in shielding from one tractor size and shape to another were explored over a normal range of gaps (20 to 60 percent of the diameter).

All TRUCK AND BUS DRAG 49 force coefficients were determined from 30-second simultaneous integrations of the halance output and the contraction pressure-drop. Surface pressure coefficients were ohtained using 10-second simultaneous integrations of surface pressure and contraction pressure-drop. Surface pressures are reported relative to empty test section static pressure at the modellocation. Modeling of On-Road Flow Field - All models were 1/7-scale, and semi-detailed. 2 m2 (including open area hetween wheels).